[rvanderpyl]

2.0-2.4 didn't pull studs because they didn't use Nikasil cylinders, they used cast iron, either completely cast iron for the T's or a cast iron cylinder with aluminum fins on E/S, Since these cylinders had nearly the same expansion ratio as the steel studs you don't have pulling problems. The Nikasil cylinders used on the 2.7 and above have a much higher rate of expansion than the studs, hence the pulling. So if you rebuild and continue to use original cylinders you don't need inserts, if you replace your cylinders with Nikasil because you are increasing your displacement you need to add inserts.